/Engine/Plugins/Animation/RigLogic/Source/RigLogicLib/Public/dna/layers/MachineLearnedBehaviorWriter.h
The neural network storage will be implicitly resized (if needed) to provide storage for the new data.
void setNeuralNetworkLayerActivationFunction ( std::uint16_t netIndex, std::uint16_t layerIndex, [ActivationFunction](API\Plugins\RigLogicLib\dna\layers\dna__ActivationFunction) function )